My application stops responding for new users after a while, although old users continue to work. The problem occurs more rapidly with increasing values of the parameters maxAsyncWriteThreads and maxAsyncWriteThreads of Atmosphere. Error logs are empty. My configuration is: CentOS 6.7, WildFly Full 9.0.1.Final, Vaadin 7.6.0, Java 1.8.25, 8 Cores and 16gb of RAM. The number of users is about 150. Current values maxAsyncWriteThreads 10, maxAsyncWriteThreads 10